Escondido Energy Storage
San Diego Gas & Electric CompanySan Diego County
Escondido Energy Storage is SDG&E’s lithium-ion battery facility in Escondido, San Diego County, with 30 MW / 120 MWh of installed nameplate capacity. The August 2026 EIA inventory lists generator SES as out of service but expected to return in the next calendar year (status OA). Its installed rating therefore does not establish currently available output. SDG&E developed the facility to support reliability after the Aliso Canyon gas-storage disruption. The utility reported a fire in one battery container on September 5, 2024; that incident history is separate from the dated EIA inventory status.
Mapped infrastructure geometry associated with this asset.
EIA plant 60570 · Inventory for Aug 2026.
No operating capacity reported in this inventory.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| SES | Batteries | Planned | 30 | 120 |
The August 2026 EIA inventory lists plant 60570 generator SES as OA: out of service but expected to return to service in the next calendar year. This is a dated inventory classification, not confirmation of a restart date.
Source: EIA August 2026 generator inventory · as of 2026-08-01
SDG&E reported a fire on September 5, 2024 in one of 24 storage containers. Its September 7 update said the fire was contained to that container, there were no injuries, and the fire had been out since early September 6.
Source: SDG&E Escondido incident update · as of 2024-09-07
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| SES | 30 MW 30 MW summer | Batteries Electricity used for energy storage · BA | Mar 2017 | Operating |
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
Deterministic links to ERCOT market resources, price records, outage disclosures, queue records, and nearby infrastructure. Candidate joins remain labeled until corroborated.
Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.
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Project milestones and public references behind the asset profile.
SDG&E filed Advice Letter 2924-E with the CPUC requesting approval of utility-owned storage EPC contracts with AES Energy Storage LLC for two projects: 30 MW / 120 MWh Escondido facility and 7.5 MW / 30 MWh El Cajon facility.
EIA-923 reports gross generation and net grid exchange for storage plants. Gross generation is shown as a discharge proxy; it is not a cycle count or conventional capacity factor.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| Palomar Energy | 559 MW | CA | |
| Miramar Energy Facility | 106 MW | CA | |
| Cuyamaca Peak Energy Plant | 48.7 MW | CA | |
| Fallbrook Energy Storage | 40 MW | CA | |
| Top Gun Energy Storage | 30 MW | CA | |
| Melrose BESS | 20 MW | CA | |
| Elliott Energy Storage | 10 MW | CA | |
| Boulevard Energy Storage | 10 MW | CA |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioCPUC approved Advice Letter 2924-E and the EPC contracts with AES Energy Storage LLC. The decision became effective on August 18, 2016.
Official start of commercial operations for the Escondido BESS facility at a press event.
EIA-860 lists generator SES with this operating date.
FERC MBR asset record shows control-transfer date of March 1, 2017 for the Escondido Energy Storage asset to SDG&E.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
The August 2026 EIA inventory lists plant 60570 generator SES as OA: out of service but expected to return to service in the next calendar year. This is a dated inventory classification, not confirmation of a restart date.
SDG&E reported a fire on September 5, 2024 in one of 24 storage containers. Its September 7 update said the fire was contained to that container, there were no injuries, and the fire had been out since early September 6.
Escondido Energy Storage reports No operating capacity reported of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Escondido Energy Storage is a batteries facility in San Diego County, CA, participating in the CAISO market.
Escondido Energy Storage is in San Diego County, CA, inside the CAISO balancing area.
Escondido Energy Storage is operated by San Diego Gas & Electric Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Escondido Energy Storage reported 91 MWh over the twelve months to 2026-07. For a storage plant this is reported gross generation — a discharge proxy, not a cycle count or a conventional capacity factor.
By capacity, Escondido Energy Storage ranks #384 of 1,061 operating plants of the same technology nationally. It ranks #128 of 272 in CA.